KR20100016586A - Illumination device - Google Patents

Abstract

The invention relates to an illumination device (10) for illuminating a surface (101), with at least one lighting element (20) and an illuminating body (30), wherein the lighting element (20) emits an artificial light (21,21), a housing element (40) comprises the lighting element (20) and supports the illuminating body(30), the illuminating body (30) comprises a transparent light conductive material suitable to illuminate the surface (101) lying subjacent. The invention discloses, that the illuminating body (30) comprises a surface pattern (80), forming a Fresnel-type lens to optically magnify the surface (101).

Description

Lighting device {ILLUMINATION DEVICE}

The present invention relates to a lighting device for illuminating a surface using at least one lighting element and a lighting body, the lighting element emitting artificial light, the housing element comprising the lighting element, supporting the lighting body, the lighting The body includes a transparent light conducting material and is generally disposed over the illuminated surface.

US 6,951,403 B2 describes a device for illuminating a generally flat surface, which device comprises a battery powered light source contained in a housing mounted with a transparent light conducting illumination body. The device may be arranged such that the illumination body lies on a book or other flat surfaces for viewing being illuminated through the transparent illumination body. The illumination body is tapered in a wedge shape to deflect the conducted light onto the lower surface. Unfortunately, the described device is generally less convenient for reading books with curved reading areas. The interaction of the curved reading area with the tapered illumination body results in a deformed image of the illuminated page. In addition, the device is a relatively thick wedge-shaped light guide, the thickness of which leads to a relatively large weight, which reduces the ease of use. This also leads to relatively large mechanical strength, making it very difficult to bend the device over the curved reading area.

In addition, there are known magnifying lenses that can be clipped onto the aforementioned lighting devices. Unfortunately, such magnification elements have a relatively low magnification. Another option to optically magnify the surface is to use a bar magnifier. Such bar expanders are often acrylic bodies, having a curved top surface, thus optically enlarging the surface on which the bar expanders are placed. Disadvantages of such bar magnifiers are their weight and distortion of the image.

Summary of the Invention

Accordingly, the present invention aims to obviate the aforementioned disadvantages. In particular, it is an object of the present invention to provide an efficient and inexpensive illumination device having a small magnification and a magnification sufficient for convenient reading.

This object is achieved by a lighting device that illuminates a surface using at least one lighting element and the lighting body, the lighting element emitting artificial light, the housing element comprising the lighting element, supporting the lighting body, The body is characterized in that it comprises a transparent light conducting material suitable for illuminating the surface located below, and the illumination body comprises a surface pattern forming a Fresnel type lens for optically enlarging the surface. Advantageous embodiments of the lighting device for illuminating the surface are defined in the dependent claims.

Within the scope of the present invention, a lighting element and a lighting body are disclosed, wherein the lighting body comprises a Fresnel type lens. By decomposing the lens into a set of refractors, Fresnel type lenses achieve a high magnification while reducing the amount of material needed compared to conventional spherical lenses. As each refractor means itself forms a spherical lens, the combination of all the refractor means becomes a large area magnifying lens with a small thickness. By decomposing the effective continuous surface of a standard lens into a set of the same or different curvature surfaces, the overall thickness of the lens is reduced, thus allowing a substantial reduction of the thickness of the lens. Such refractor means may have a straight or curved profile with constant or random spacing and may vary from micrometer to millimeter dimensions. The configuration of the refractors means and thus of the surface pattern can have a circular, linear or non-uniform pattern.

Further, the refractor means may have the same cross section as the lineup of small triangles, swings or parallelograms. The refractor means can have a uniform design throughout the surface of the illumination body. In another preferred embodiment, the design of the refractors means can vary along the major axis of the illumination body.

In another preferred embodiment, each refractor means comprises a sawtooth cross section. In order to achieve the required magnification, each refractor means comprises a facet surface and a relief surface. The facet surface slopes up as the distance to the optical axis decreases. The relief surface then sharply descends towards the base of the surface pattern. Thus, a sawtooth structure having a triangular shape is formed. The angle between the base of the surface pattern and the facet surface can be between 0 degrees and 30 degrees, and can be increased to 40 degrees, even 50 degrees when using larger diameter lenses. The pitch of the sawtooth structure may be between 1 mm and 10 micrometers, more preferably between 200 and 50 micrometers, in order to be invisible to the human eye.

The disclosed lighting device includes the ability to illuminate and optically enlarge the surface. When used as a readout and magnification lamp, the illumination body of the lighting device is generally positioned on the surface being illuminated while the Fresnel type lens optically magnifies the surface. Thus, in another preferred embodiment, the surface pattern is constructed on one of the surfaces of the lighting body. Preferably, the surface pattern covers the upper or lower surface of the lighting body. For example, if the user wants to read a book, the lighting body should be kept on the pages so that the text can be optically enlarged. The magnification is a function of the distance between the object, for example text and the lens, and the focal length of the lens, so that when the lens has a focal length of 50 mm to 300 mm, the illumination body can achieve a magnification of 1.15 to 8 times. It must be kept on the object at a distance of mm to 100 mm. In another preferred embodiment, the illumination body and the surface pattern are one part.

In another preferred embodiment, the surface pattern is configured to optically magnify the surface on the one hand and receive and deflect artificial light emitted on the surface by the lighting element on the other hand. The disclosed lighting device combines the ability to illuminate the surface with the ability to magnify the surface. When the lighting element of the disclosed lighting device is configured on one of the sides of the lighting body, the lighting element injects artificial light into the lighting body. The grooves that make up the surface pattern serve as light extraction features. Artificial light collects in the illumination body through the relief surface of the surface pattern and exits therefrom. Thus, uniform illumination of the surface located below the illumination body is possible. This ability is coupled with the enlargement of the surface.

If a normal light source is used for example to read a book, this light source can disturb others, especially when used in the bedroom. In order to prevent disturbance to others, the lighting device described in the present invention can be used as a light source for reading. Therefore, it is important that the emitted artificial light illuminate only the pages of the book, not the surroundings. Thus, the lighting element must be mounted on one of the sides of the lighting body. The light injected into one of the sides should be deflected, so that as much light as possible should be emitted through the underside of the lighting body, for example on a sheet of a book. Thus, the surface pattern that deflects artificial light must be transparent to the light reflected by the surface of the sheet, so that the text covered by the illumination body is illuminated so that it can be easily viewed by a person. In addition, the surface pattern may be transparent to ambient light emitted over the light extraction layer.

As described, the lighting element may be configured on one of the sides of the lighting body. In order to achieve a low attenuation of the crossover of artificial light emitted by the lighting element into the lighting body, the lighting element can be glued on the side of the lighting body. Preferably, the adhesive used has the same refractive index as the material of the lighting body. Thus scattering, deflection or attenuation will not occur. In another preferred embodiment, the lighting element is configured adjacent to the side of the lighting body, but an illumination gap is constructed between the lighting element and the side. In this configuration, part of the artificial light is injected into the lighting body, while the other part directly illuminates the surface located under the lighting device. The amount of light that directly illuminates the surface without being injected into the illumination body is determined by the size of the illumination gap. In addition, an additional lens may be mounted in the lighting element to increase or decrease the amount of artificial light illuminating the surface directly. Such lenses can focus or scatter artificial light.

Preferably, the lighting element is at least one of LED, OLED, incandescent lamp or fluorescent lamp. Depending on the type of use of the lighting device, single or multiple lighting elements can be used. Light emitting diodes (LEDs) are semiconductor devices that emit a narrow, incoherent, narrow spectrum of light (typically around 10-20 nm) when electrically biased forward. The color of light emitted depends on the composition and conditions of the semiconductor material used. Moreover, phosphor converted LEDs can be used. In such cases, the phosphor (s) may also affect the color and spectrum of the light emitted. Also available are organic light emitting diodes (OLEDs) of a special type of LED in which the light emitting layer comprises a thin film of certain organic components. The advantage of an OLED is that it is a uniform large area light source with potentially low cost and high efficiency. OLEDs generate light using current flowing through a thin film of organic material. The efficiency of energy conversion from color to current and light to light emitted is determined by the composition of the organic thin film material.

In a preferred embodiment, the illumination body covers an area having a size of at most 300 cm ² , preferably 100 cm ² . If the lighting device is used as a light source for reading, the lighting device should be small and light so that it can be conveniently used. As the perceptual study shows, an illumination area of about 1 cm x 5 cm is convenient for reading. As a result, LEDs with a power consumption of less than 50 mW, preferably less than 10 mW, achieve an illumination level preferably of 25-2000 lux, more preferably 50-250 lux, most preferably 75 lux. Enough to do that.

In another preferred embodiment, the lighting element is arranged below the lighting body. In this configuration, artificial light is not injected into the illumination body, but directly illuminates the surface. In order to focus artificial light onto the surface, a lens can be inserted into the lighting element. This embodiment has the advantage that no optically difficult connection between the lighting element and the lighting body needs to be made. In addition, the materials used for the surface pattern need not be selected in terms of their ability to receive and deflect artificial light. Thus, a cheap and simple lighting device is obtained that can be used to optically enlarge and illuminate large surfaces.

In another preferred embodiment, the lighting body comprises a light extraction layer configured to receive artificial light from the lighting element and deflect it onto the surface. In this embodiment, the ability of the surface pattern to receive and deflect artificial light is enhanced by the light extraction layer. Preferably, the light extraction layer covers the top surface of the illumination body not facing the surface, while the surface pattern covers the bottom side of the illumination body neighboring the surface to be illuminated. In this configuration, the surface pattern optically magnifies the surface, while the light extraction layer deflects artificial light injected from one of the sides of the illumination body. Due to the assignment of the individual tasks, the light extraction layer as well as the surface pattern can be optimally designed. In order to use the lighting device as a light source for reading, the light extraction layer deflecting artificial light must be transparent to the light reflected by the surface of the sheet.

In another preferred embodiment, the illumination body comprises a first section and a second section, at least a part of the first section being covered with a surface pattern, and at least a part of the second section being covered with a light extraction layer. Unlike the above embodiments, the parts of the illumination body covered by the light extraction layer and the surface pattern are separated. When used as a reading light source, the lighting body may comprise an inner segment which is covered with a surface pattern and thus a first section which enlarges the surface disposed under the lighting device. This first section may be surrounded by the second section and used to receive and deflect artificial light emitted by the lighting element. In order to achieve uniform illumination of the surface, the surface structure of the light extraction layer is adapted to emit artificial light in such a way that it is emitted from the illumination body at an angle that illuminates the surface located below the first section towards the center of the illumination body. Can deflect. This embodiment has the advantage that different materials can be used for each of the first and second sections.

In another preferred embodiment, a plurality of lighting elements are arranged on the outer edge of the lighting body. Thus, uniform illumination of the illumination body and / or the surface can be achieved. The artificial light emitted by each of the lighting elements can be emitted directly onto the surface or deflected onto the surface after being injected into the lighting body. These embodiments have the advantage that each of the lighting elements can only have a low light output due to the use of a large number of lighting elements. Therefore, the generated heat and the required energy of each lighting element is small. In addition, due to the reduced size of the lighting elements, a rim supporting the lighting body and comprising the lighting elements can be small. Thus, convenient operation of the lighting device is possible.

The object of the invention is also achieved by mounting for supporting a lighting device according to the described embodiments, which mounting is arranged away from the surface, so that the surface can be magnified. Thus, the mounting must have mounting means to which the lighting device is connected. The mounting means can be clipped connections which allow the lighting device to be connected and detached from the mounting means as required. In addition, the mounting means may comprise a distance element which positions the lighting device within a certain distance from the object to be observed, so that the desired magnification is achieved by the surface pattern.

In order to adapt a lighting device to a torch type device, the present invention discloses a condenser element. The condenser element utilizes a portion of artificial light that does not reach the surface and / or is not directed to the surface. Thus, the condenser element is configured to receive and direct at least some of the artificial light emitted from the illumination body. To achieve this object, the condenser element is an optical system that can be composed of a single or a plurality of lenses and / or mirrors. The artificial light emitted from the illumination body through one of its outer faces can have a diffusion distribution. The condenser element can reshape the artificial light beam to obtain a focused and / or parallel beam. With the aid of the condenser element, the disclosed lighting device can be used not only as a light source for reading, but also as a torch.

Depending on the type of use, the condenser element can be configured on different outer sides of the lighting body. Preferably, the condenser element is configured on the longitudinal side of the lighting body, so that the artificial light emitted from these longitudinal sides can be rearranged. Since the artificial light emitted through the lower side from the lighting body can only have a small deflection angle with respect to the lighting device, it is also possible for the condenser element to collect and rearrange portions of this light. Thus, the condenser element can have a size larger than the height of the lighting body.

In order to achieve a rearrangement of the luminous flux of artificial light, the condenser element may comprise a surface formation. The surface formation may cover large portions of the condenser element, in particular portions of the condenser element that are not in direct contact with the lighting body. Thus, the artificial light exiting from the illumination body through the longitudinal side can cross directly into the condenser element. The element just mentioned may comprise a light conducting material, so that the artificial light is guided without attenuation. The light conducting material of the condenser element can be the same material used for the lighting body.

The surface formation can focus or shape the artificial light in a parallel manner. To achieve this object, the surface formation may comprise a serrated cross section which slopes down as the distance from the center of the condenser element increases. Each element of the surface formation may have a width of 10 micrometers to 10 mm, preferably 30 micrometers to 3 mm, most preferably 100 micrometers to 1 mm. The forming angle between the condenser element and the downwardly inclined side of the surface formation may be between 0.1 and 5 degrees, preferably between 0.2 and 3 degrees, more preferably between 0.25 and 2 degrees. Such surface formation may be constructed in such a way as to form a Fresnel type lens.

In another preferred embodiment, the condenser element can be reversibly attached to the lighting device. This allows the user to use the lighting device for two different purposes. On the other hand, the lighting device can be used as a reading light source for illuminating pages of a book. On the other hand, the condenser element can be attached to the lighting device so as to obtain a torch type device that can illuminate any point around it. Preferably, the condenser element comprises a clip means, which clip means cooperates with a second clip means of the illuminating body to attach the condenser element to the illuminating body. By using these two clip means, the condenser element can be easily attached to the lighting body. The user can attach and / or detach the condenser element without the need for tools or other elements.

In another preferred embodiment, the condenser element comprises a variable lens element. With the aid of the variable lens element, the reception and directing of at least some of the artificial light can be adjusted. Thus, it is possible to shape the artificial light beam in different ways. If necessary, a focused light spot can be obtained, or the luminous fluxes can be configured in parallel to illuminate a larger area. Preferably, the variable lens element is formed by an LC (liquid crystal) structure.

In order to achieve uniform illumination in a combination independent of the position of the lighting device, another embodiment of the invention provides that the lighting device comprises at least a first lighting means and a second lighting means, the first lighting means and the second lighting means. It is disclosed that the means is configured to illuminate at least partially different sections of the surface. The first lighting means and the second lighting means are used to illuminate the surface. To achieve this object, they direct artificial light emitted by the lighting element, or they form the lighting element, and they emit artificial light themselves. A user who wishes to change the distance of the lighting device from the surface can choose to illuminate the surface from two lighting means. Since the first and second illumination means are configured at varying distances from the center of the Fresnel lens, they illuminate at least partially different sections of the surface. This has the advantage that the light sources provide a uniform light distribution over different positions of the lens with respect to the object to be illuminated. Depending on the distance the user configures the lighting device, the user can select the first and / or second lighting means.

In an advantageous embodiment, the first lighting means and the second lighting means are configured between the refractor means. The lighting body comprises a transparent light conducting material, but can attenuate the artificial light beam emitted by the lighting element. Thus, it may be appropriate to integrate the first and second lighting means into the refractors. In order to prevent degradation of the overall image quality, the first and / or second illumination means must have a small diameter and be configured in the refractor means far from the focal point of the Fresnel type lens. Diameters in the range of 1 micrometer to 1 mm have proven beneficial.

In another embodiment, the first lighting means and the second lighting means are configured in the lighting body. This embodiment has the advantage that the requirements regarding size and position for the first and second lighting means are less stringent than the above-described embodiment. Thus, depending on the distance of the lighting device from the surface, macroscopic first and second lighting means can also be embedded in the lighting body for illuminating different sections of the surface.

According to another preferred embodiment, the first lighting means and / or the second lighting means are optical fibers. In this embodiment, the optical fibers are used to conduct artificial light emitted by the remotely placed lighting element. Since the optical fibers have a small diameter, they can be wound along the grooves of the Fresnel lens. The lighting element can be provided with a lighting system so that the injection of artificial light into the first and / or second lighting means can be controlled. Depending on the distance of the lighting device to the surface, artificial light is injected into the first or second lighting means. The cladding surrounding the inner core of the optical fiber may be incomplete, and thus artificial light may be emitted onto dedicated spots from the optical fiber to illuminate the surface.

The optical fiber used may be a cylindrical dielectric waveguide that transmits light along its optical axis by a total internal reflection process. The optical fiber consists of a core surrounded by a cladding layer. The boundary between the core and the cladding may be sharp in step-index fibers or gradual in graded index fibers. The principle of operation of the optical fiber used applies to a number of variants including multimode optical fibers or single mode optical fibers. Depending on the type of use of the lighting device, the optical fiber can be made of glass or polymer. Optical fibers made of plastic are typically stepped refractive index multimode optical fibers having a core diameter of 1 mm or more. Plastic optical fibers often experience much greater attenuation than glass optical fibers, which limits the range of devices using optical fibers of that kind. Often, the inner core of the optical fiber is made of polymethyl methacrylate (acrylic) and the cladding material is a fluorinated polymer. Optical fibers are also based on perfluorinated polymers (primarily polyperfluorobutenylvinylether).

In order to obtain light that is more comfortable for reading, the first and / or second illumination means may be doped with color means, which color means change the wavelength of the artificial light by absorption or re-emission. The color means may comprise a phosphor that changes the blue light transmitted by the optical fiber to another wavelength. In addition, the optical fibers can be clad with a phosphor layer to achieve the same purpose. Alternatively, the collar means can be configured in small cavities inside the lighting body.

Reflecting means can be used to minimize the glare effect and to suppress some of the artificial light illuminating the user directly. The reflecting means is formed to reflect the artificial light emitted by the first and / or second lighting means in a direction that does not lead to surface illumination. The reflecting means can be a mirror and / or a reflective coating. The coating can be superimposed on the optical fibers, so that the artificial light emitted by the first and / or second illumination means is reflected onto the surface. In addition, the reflecting means prevents the artificial light emitted by the optical fibers embedded in the refractors from being injected into the lighting body, since this may irritate the user of the lighting device.

The above-described lighting device as well as the components used according to the invention in the claimed components and in the described embodiments have no particular exception with regard to size, shape, material selection. Technical concepts that allow selection criteria to be known in the art may be applied without limitation. Further details, features, and advantages of the object of the invention are disclosed in the following description of the respective figures, which show, by way of example only, the dependent claims and a number of preferred embodiments of the lighting device according to the invention.

1 shows a lighting device with a lighting body and a lighting element.

2 shows a lighting device having a lighting gap between a lighting element and a lighting body.

3 is a cutaway view of the lighting body of FIG. 2;

4 shows another embodiment of a lighting device.

5 is a plan view of the lighting apparatus of FIG. 4.

6 shows another embodiment of a lighting device.

7 shows a lighting body having two rows of lighting elements.

8 shows a lighting body surrounded by a plurality of lighting elements.

9 shows a lighting body with a condenser element;

10 shows a further embodiment of a lighting body having a condenser element.

11 shows a lighting body having a first lighting means and a second lighting means.

12 shows a further embodiment of the first and second lighting means.

13 shows another embodiment of a lighting body in which first and second lighting means are incorporated.

In FIG. 1, an illumination device 10 is shown for illuminating the surface 101 of the object 100. The lighting device 10 comprises a lighting element 20 and a lighting body 30. The lighting element 20 is configured under the housing element 40 which supports the lighting body 30. In the illustrated embodiment, the lighting device 10 is a reading light source used to illuminate a generally flat surface 101 of an object 100, such as a page of a book, located underneath the lighting body 30. In order to optically enlarge the surface 101, the illumination body 30 comprises a surface pattern 80 forming a Fresnel type lens. These Fresnel type lenses can achieve large magnifications without the need for a fairly thick illumination body 30.

The lighting element 20 is an LED that injects artificial light 21 into the lighting body 30. The lighting element 20 is connected with a housing element 40, which can be a printed circuit board (PCB). Such printed circuit boards are used to mechanically support and electrically connect electronic components using conductive passages etched from copper sheets stacked on a nonconductive substrate. Such structures are known to be inexpensive and very reliable. In addition, the LED can be directly connected to the electronic components with the aid of a PCB. A driver 62 and a battery 61 are installed on the housing element 40 opposite the lighting element 20. The battery 61 is preferably rechargeable and delivers the current required for the lighting element 20. The driver 62 may include a current amplifier circuit and a waveform generation and control circuit for outputting a desired waveform. In addition, the amplitude, frequency, and duty ratio of the waveform are adjusted by the waveform generation and control circuit.

In order to use the lighting device 10 in areas where power is difficult or expensive, the solar cell 60 can be disposed on the housing element. Solar cell 60 converts photons from sunlight into electricity stored in a rechargeable battery. Thus, when the lighting device 10 is exposed to sunlight during the day, the lighting device 10 can be used in the dark. In order to obtain a lighting device 10 that can illuminate a surface for a long time despite the solar cell 60, a lighting element 20 with low power consumption is required. LEDs have proven to be appropriate because LEDs get enough light level while consuming low power.

As measured experimentally, the surface pattern 80 not only optically enlarges the surface 101, but also guides the artificial light 21 injected into the lighting element 20. Thus, the surface pattern 80 of the illumination body 30 fulfills two tasks. On the other hand, the surface pattern 80 optically enlarges the surface 101. On the other hand, the surface pattern 80 is formed by a plurality of refractor means 81 having light extraction features. Artificial light 21 is collected towards refractor means 81 and emitted above surface 101. Thus, the mentioned surface 101 is illuminated and optically enlarged at the same time.

In order to reduce the amount of artificial light 21 scattered to the environment without deflecting onto the surface 101, the present invention discloses a light extraction layer 50. The configuration of the light extraction layer 50 is shown in FIGS. 2 and 3, which only show the illumination body 30. Artificial light 21 is injected into the illumination body 30 from the left side. In order to deflect the artificial light 21 onto the surface 101 positioned below the illumination body 30, the light extraction layer 50 has a surface structure. This surface structure comprises a plurality of deflection means 51 which are continuously configured. Each deflection means 51 can have a serrated cross section with a flange 53 which rises sharply from the illumination body 30. The deflection means 51 then have a face 52 which slopes downward as the distance to the lighting element 20 increases. The face 52 has an angle 54 which is measured with respect to the longitudinal extension of the illumination body 30. Depending on the wavelength of the artificial light 21 and the refractive index of the material used for the illumination body 30, the angle 54 should be 0.1 to 5 degrees, preferably 0.25 to 2 degrees.

The surface pattern 80 necessary to enlarge the appearance of the surface 101 comprises a plurality of refractor means 81. Each refractor means 81 is configured continuously to cover the bottom 35 of the illumination body 30. In the embodiment shown, each refractor means 81 has a serrated cross section with a flange 83 which rises sharply from the illumination body 30. The refractors 81 then have a facet surface 82 which slopes downward as the distance to the illumination element 20 decreases. Thus, the sawtooth structure is opposite to that of the extraction layer 50. In order to achieve uniform magnification of the surface 101, the refractor means 81 may be configured in a non-uniform manner. In addition, the angle 84 between the facet surface 82 and the longitudinal axis of the illumination body 30 may vary with respect to the distance to the illumination element 20. The refractor means 81 may be of a linear structure and thus the surface pattern 80 may comprise a plurality of rows of refractor means 81. In another embodiment, the surface pattern 80 may comprise refractor means 81 composed of a plurality of concentric rings. The Fresnel lens thus formed may be corrected for spherical aberration.

The lighting element 20 shown in FIG. 2 is not in direct contact with the lighting body 30. Rather, an illumination gap 15 is constructed between the illumination element 20 and the side 36 of the illumination body. Thus, a portion 21 'of artificial light will be injected into the illumination body 30. The other portion 21 of artificial light will be emitted directly above the surface 101. This embodiment has the advantage that the direct light 21 as well as the indirect light 21 'are used to illuminate the surface. This leads to very uniform illumination, which improves the contrast and readability of the book located under the illumination device 10.

In FIG. 4, another embodiment of a lighting device 10 is shown. The lighting body 30 is divided into a first section 37 and a second section 38. The lower side of the first section 37 of the illumination body 30 is covered with a surface pattern 80 forming a Fresnel type lens. Thus, the object 100 located below the first section 37 is optically enlarged. In order to illuminate the surface 101 of the object 100, the second section 38 of the illumination body 30 comprises a light extraction layer 50. The artificial light 21 injected into the illumination body 30 is received and deflected by the light extraction layer 50 and guided onto the surface 101. Since the surface 101 is located below the first section 37 and not below the second section 38, the artificial light 21 ′ is deflected at an angle. As shown in FIG. 4, the deflected artificial light 21 ′ emits from the second section 38, but illuminates the surface 101 located below the first section 37. This configuration is clarified by FIG. 5, which shows a plan view of the lighting device 10 of FIG. 4. Object 100 having surface 101 is located below first section 37 of lighting body 30. On and in the illumination body 30, the refractor means 81 of the surface pattern 80 are configured concentrically. Since the illumination body 30 has a width 33 smaller than the size of the surface 101, only a portion of the surface 101 positioned below is optically enlarged by the Fresnel type lens. In order to illuminate the surface 101, the second section 38 is covered with a light extraction layer 50.

The lighting device 10 shown in FIG. 6 comprises a lighting element 20 configured adjacent to the housing element 40. The artificial light 21 emitted by the lighting element 20 is not injected into the lighting body 30. Rather, artificial light 21 illuminates surface 101 directly. Thus, no adaptation between the lighting element 20 and the illumination body 30 to prevent absorption of artificial light 21 need to be made. In addition, the exchange of the lighting elements 20 can be made easily, and no disassembly of the entire lighting device and the lighting body 30 is necessary.

As shown in FIGS. 7 and 8, the lighting device 10 may comprise a plurality of lighting elements 20. Preferably, these lighting elements 20 are configured adjacent to the sides 36, 36 ′. In FIG. 7, the lighting elements 20 consist of two rows facing each other on the sides 36, 36 ′. 8 shows another embodiment in which the lighting elements 20 surround the entire lighting body 30. Due to the fact that the total luminous flux required is not emitted by one but by the plurality of lighting elements 20, the individual light output, and therefore the size of each lighting element 20, can be reduced. Thus, a thin design of the lighting device 10 and the lighting body 30 is realized.

In order to achieve the ability to use the lighting device 10 as a torch, a condenser element 90 is disclosed. 9, a cross section of the condenser element 90 connected to the longitudinal side 36 of the illumination body 30 is shown. The artificial light 21 injected into the illumination body 30 and not only or slightly deflected by the light extraction layer 50 can exit the illumination body 30 without illuminating the surface 101 as intended. To use this portion of artificial light 21, condenser element 90 comprises a light conducting material configured to receive and direct at least a portion of artificial light 21. Thus, the condenser element 90 comprises a surface formation 91 having a serrated structure in the example shown. This surface formation 91 may also form a Fresnel type lens for focusing artificial light emitted from the condenser element 90. The condenser element 90 may also comprise a clip means 92, which cooperates with the second clip means 93 of the lighting body 30. Through the connection of the clip means 92 and the second clip means 93, the condenser element 90 can be reversibly attached to the illumination body 30.

10 shows the effect of the condenser element 90. Artificial light 21 enters into the illumination main body 30 from the left side. Portions of the artificial light 21 will pass through the light extraction layer 50 and deviate from the lighting body 30 through the top of the lighting body 30. Other portions of the artificial light 21 will be slightly deflected by the light extraction layer 50 and out of the illumination body 30 through a bottom 35 through a small angle. The third portion of artificial light 21 will exit illumination body 30 through side 36. Thus, depending on the last mentioned portion and the size of the condenser element 90, part of the final but one mentioned portion of the artificial light 21 will enter into the condenser element 90. Since the condenser element 90 comprises a light conductive material, the artificial light 21 will not be attenuated. The outer side of the condenser element 90 includes a surface formation 91 configured to receive and deflect the collected artificial light 21. Surface formation 91 has the ability to shape artificial light beam 21 'condensed from condenser element 90 or exiting as parallel light beam as shown. Thus, the lighting device 10 can be used as a torch.

The illuminating device 10 disclosed has the benefit of being able to illuminate the surface 101 and at the same time optically enlarge it. A potential user sees through the illumination body 30 which includes a surface pattern 80 forming a Fresnel type lens. In order to ensure that the surface 101 is always uniformly illuminated, another embodiment of the present invention provides that the lighting device 10 comprises at least first lighting means 110 and second lighting means 120, and It is disclosed that the first lighting means 110 and the second lighting means 120 are configured to illuminate at least partially different sections 102, 102 ′ of the surface 101. This embodiment uses at least two lighting means installed at varying distances from the center 84 of the Fresnel type lens. In order to clarify the positions of the first and second illumination means, the center 84 of the Fresnel type lens is indicated in FIG. 10. By placing the first lighting means 110 and the second lighting means 120 at different distances from the center 84 of the lens, the surface 101 is related to the distance of the illumination body 30 with respect to the object 100. Will always be uniformly illuminated.

11 shows a cross section of a part of the illumination body 30. The center of lens 84 is shown schematically in a vertical line. The first lighting means 110 is formed by two optical fibers embedded in the two refractor means 81 of the surface pattern 80. The second lighting means 120 is also formed by one optical fiber embedded in the other refractor means 81 of the lighting body. The position of the second illumination means 120 is closer to the center 84 of the Fresnel type lens than the position of the first illumination means 110. Artificial light 21, 21 ′ emitted by the first lighting means 110 and the second lighting means 120 is generated in the lighting element 20 and injected into the optical fibers. The optical fibers transmit artificial light 21, 21 ′ and permit controlled out coupling of artificial light 21, 21 ′ towards the object 100. Each of the optical fibers forming the first and second lighting means 110, 120 can be connected to a separate lighting element 20. The user can activate the desired lighting element 20 with a push button. Depending on the distance of the lighting device 10 to the surface 101, the user can select from two lighting elements 20 which are respectively connected to the lighting means 110, 120 to achieve uniform illumination of the surface 101. You can choose.

In FIG. 11, the first lighting means 110 and the second lighting means 120 are formed by a plurality of optical fibers. The optical fibers have the advantage that they can be easily embedded in the grooves forming the refractor means 81 of the Fresnel type lens. In addition, the optical fibers have a small diameter and can be located far from the center 84 of the lens. In addition, the lighting element 20 for generating artificial light 21, 21 ′ may be remotely located with respect to the lighting body 30. In the alternative embodiment shown in FIG. 12, the first and second illumination means 110, 120 are formed by light sources rather than an optical fiber. In order to achieve this object, the first lighting means 110 and / or the second lighting means 120 are the lighting elements themselves. Thus, artificial light 21, 21 ′ is produced only by the first and second lighting means 110, 120. In addition, both illumination means 110, 120 may be arranged on the surface of the illumination body 30 formed by the refractors 81. In addition, the first and second lighting means 110, 120 are mounted on the reflecting means 130. The reflecting means 130 has the benefit of preventing glare. Artificial light 21, 21 ′ that does not propagate toward the object 100 may enter the illumination body 30 and thus may irritate a user of the illumination device 10. To prevent this, the reflecting means 130 reflects the artificial light 21, 21 ′ in such a way that only the object 100 is illuminated. Reflecting means 130 may be formed by a mirror and / or a reflective coating.

13 shows another embodiment of a lighting device 10. In this embodiment, the first illumination means 110 and the second illumination means 120 are formed by optical fibers embedded in the illumination body 30 using a low reflectivity adhesive. To prevent glare, the optical fibers are shielded by reflecting means 130 formed by a foil-like sheet mounted on top of the optical fibers. 13 shows the ability of a modified lighting device 10 to illuminate at least partially different sections 102, 102 ′ of the surface 101. Depending on the distance of the lighting device 10 to the surface 101, the user may decide to activate only the first lighting means 110. The artificial light 21 emitted by the lighting element 20 is injected into the lighting means 110 and is emitted in such a way that a large section 102 of the surface 101 is illuminated. If the user decides to reduce the distance of the lighting device 10 with respect to the surface 101, the user's field of view may no longer be uniformly illuminated. In particular, the luminous flux can be reduced towards the center 84 of the lens. Thus, the user may additionally or alternatively activate the second lighting element for injecting artificial light 21 ′ into the second lighting means 120. Artificial light 21 ′ illuminates a partially different section 102 of surface 101. Thus, the user continues to have uniform illumination with respect to the point of the surface 101 with the aid of the lighting device 10.

The first lighting means 110 and the second lighting means 120 can simultaneously form cavities filled with luminescent material to change the color of the light emitted from the lighting means 110, 120. Organic luminescent materials, such as Lumogen from BASF, are the preferred luminescent materials because they can be easily dispersed within the lighting means and / or the lighting body 30. The illumination body may comprise cavities spaced from the lighting means 110, 120 and filled with a luminescent material. Light emitted from the luminescent material in these cavities should not reach the user directly in order not to interfere with the viewing of the illumination object 100. Thus, it is desirable to cover the cavities with a reflective layer on the side facing the user to reflect the light emitted towards the user towards the object 100 to be illuminated.

List of reference numbers

10: lighting device

15: lighting gap

20: lighting elements

21, 21 ': artificial light

30: lighting body

33: width of illumination body 30

34: upper surface of the lighting body 30

35: bottom of the lighting body 30

36, 36 ': side of lighting body 30

37: first section

38: second section

40: housing element

50: light extraction layer

51: deflection means

52: face of the deflection means 51

53: flange of the biasing means 51

54: angle of light extraction layer

60: solar cell

61: battery

62: driver

80: surface pattern

81: refractor means

82: facet of the refractor means 81

83: flange of the refractor means 81

84: center of Fresnel type lens

100: object

101: surface of the object 100

102, 102 ': section of surface 101

110: first lighting means

120: second lighting means

130: reflecting means

Claims (22)

As illumination device 10 for illuminating surface 101, Has at least one lighting element 20 and a lighting body 30, The lighting element 20 emits artificial light 21, 21 ′, A housing element 40 comprises the lighting element 20, supporting the lighting body 30, The illumination body 30 comprises a transparent light conducting material suitable for illuminating the surface 101 located below, The illuminating device (30) comprises a surface pattern (80) for forming a Fresnel type lens for optically enlarging the surface (101). The surface pattern (80) of claim 1, wherein the surface pattern (80) comprises a plurality of refractor means (81), preferably the surface pattern (80) is the surfaces (34, 35, 36) of the illumination body (30). 36 '), and more preferably the illumination body (30) and the surface pattern (80) are one piece. 3. Each refractor means 81 optically enlarges the surface 101 on the one hand and receives artificial light 21, 21 ′ from the lighting element 20 on the other hand. And deflect onto said surface (101). The surface pattern (80) according to any one of claims 1 to 3, wherein the surface pattern (80) is transparent to artificial light (21, 21 ') reflected by the surface (101), and the surface pattern (80) is Illumination device, characterized in that it is transparent to ambient light directed above the surface pattern (80). 5. The lighting element 20 according to claim 1, wherein the lighting element 20 is configured adjacent to the sides 36, 36 ′ of the lighting body 30, preferably with the lighting element 20. An illumination device, characterized in that an illumination gap (15) is arranged between the sides (36, 36 ') of the illumination body (30). 6. The lighting device as claimed in claim 1, wherein the lighting element is arranged under the lighting body. 7. The illumination body 30 according to claim 1, wherein the illumination body 30 is configured to receive artificial light 21, 21 ′ from the illumination element 20 and to deflect onto the surface 101. And a light extraction layer (50), preferably said light extraction layer (50) comprises a surface structure. The method of claim 7, wherein The lighting body 30 comprises a first section 37 and a second section 38, at least a portion of the first section 37 being covered with the surface pattern 80, and the second section ( At least a portion of the 38) is covered with the light extraction layer (50). The lighting device (10) according to any one of the preceding claims, wherein the lighting device (10) comprises a plurality of lighting elements (20) configured adjacent to the sides (36, 36 ') of the lighting body (30). Illumination device, characterized in that. 10. The lighting device according to any one of the preceding claims, wherein the lighting device (10) is provided in a mounting, the mounting disposing the lighting device (10) away from the surface (101), The lighting device can thus be magnified and observed. The lighting device (10) according to any of the preceding claims, wherein the lighting device (10) comprises a condenser element (90), the condenser element (90) leaving artificial light (21) leaving the lighting body (30). 21 ') configured to receive and direct at least a portion of the same. 12. A lighting device as claimed in claim 11, wherein said condenser element (90) is arranged on a longitudinal side of said illumination body (30). 13. The condenser element (90) according to claim 11 or 12, wherein the condenser element (90) comprises a surface formation (91), preferably the surface formation (91) is between 0.1 and 5 degrees, preferably Is a tooth shape comprising a forming angle of 0.2 degrees to 3 degrees, more preferably 0.25 degrees to 2 degrees, and more preferably the surface formation 91 forms a Fresnel type lens. . 14. The condenser element (90) according to any one of claims 11 to 13, wherein the condenser element (90) is reversibly attachable to the illumination body (30), preferably the condenser element (90) is provided with a clip means (92). And the clip means (92) attaches the condenser element (90) to the illumination body (30) in cooperation with the second clip means (93) of the illumination body (30). 15. The illumination according to any one of claims 11 to 14, wherein the condenser element 90 comprises a variable lens element, preferably the variable lens element is formed by a liquid crystal (LC) structure. Device. The lighting device (10) according to claim 1, wherein the lighting device (10) comprises at least a first lighting means (110) and a second lighting means (120), the first lighting means (110) and Lighting device (120), characterized in that the second lighting means (120) is configured to illuminate at least partially different sections (102, 102 ′) of the surface (101). 18. A lighting device according to claim 16, wherein said first lighting means (110) and said second lighting means (120) are arranged between said refractor means (81). 18. A lighting device according to claim 16, wherein said first lighting means (100) and said second lighting means (120) are configured in said lighting body (30). 19. The method of claim 16, wherein the first lighting means 110 and / or the second lighting means 120 are optical fibers, preferably the first lighting means 110 and / or 19. Or said second lighting means (120) is doped with color means, said color means shifting the wavelength of said artificial light (21, 21 ') by absorption or re-emission. 20. The lighting as claimed in claim 16, wherein at least one of the first lighting means 110 or the second lighting means 120 is the lighting element 20. 20. Device. 21. The lighting device (10) according to any one of claims 16 to 20, wherein said lighting device (10) comprises at least one reflecting means (130), said reflecting means (130) for said artificial light (21, 21 '). Reflecting, more preferably said reflecting means (130) is arranged adjacent to said first illuminating means (110) and / or said second illuminating means (120). 22. A lighting device as claimed in claim 21, wherein said reflecting means (130) is a mirror and / or a reflective coating.

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